Have Node::document() return a reference instead of a pointer

Source/core/page/PrintContext.cpp

 /*
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2007 Apple Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 221 matching lines @@
         object = object->parent();
     if (!object)
         return 0;
     return toRenderBoxModelObject(object);
 }
 
 int PrintContext::pageNumberForElement(Element* element, const FloatSize& pageSizeInPixels)
 {
     // Make sure the element is not freed during the layout.
     RefPtr<Element> elementRef(element);
-    element->document()->updateLayout();
+    element->document().updateLayout();
 
     RenderBoxModelObject* box = enclosingBoxModelObject(element->renderer());
     if (!box)
         return -1;
 
-    Frame* frame = element->document()->frame();
+    Frame* frame = element->document().frame();
     FloatRect pageRect(FloatPoint(0, 0), pageSizeInPixels);
     PrintContext printContext(frame);
     printContext.begin(pageRect.width(), pageRect.height());
     FloatSize scaledPageSize = pageSizeInPixels;
     scaledPageSize.scale(frame->view()->contentsSize().width() / pageRect.width());
     printContext.computePageRectsWithPageSize(scaledPageSize, false);
 
     int top = box->pixelSnappedOffsetTop();
     int left = box->pixelSnappedOffsetLeft();
     size_t pageNumber = 0;
     for (; pageNumber < printContext.pageCount(); pageNumber++) {
         const IntRect& page = printContext.pageRect(pageNumber);
         if (page.x() <= left && left < page.maxX() && page.y() <= top && top < page.maxY())
             return pageNumber;
     }
     return -1;
 }
 
 void PrintContext::collectLinkedDestinations(Node* node)
 {
     for (Node* i = node->firstChild(); i; i = i->nextSibling())
         collectLinkedDestinations(i);
 
     if (!node->isLink() || !node->isElementNode())
         return;
     const AtomicString& href = toElement(node)->getAttribute(HTMLNames::hrefAttr);
     if (href.isNull())
         return;
-    KURL url = node->document()->completeURL(href);
+    KURL url = node->document().completeURL(href);
     if (!url.isValid())
         return;
-    if (url.hasFragmentIdentifier() && equalIgnoringFragmentIdentifier(url, node->document()->baseURL())) {
+    if (url.hasFragmentIdentifier() && equalIgnoringFragmentIdentifier(url, node->document().baseURL())) {
         String name = url.fragmentIdentifier();
-        Element* element = node->document()->findAnchor(name);
+        Element* element = node->document().findAnchor(name);
         if (element)
             m_linkedDestinations.set(name, element);
     }
 }
 
 void PrintContext::outputLinkedDestinations(GraphicsContext& graphicsContext, Node* node, const IntRect& pageRect)
 {
     if (!m_linkedDestinationsValid) {
         collectLinkedDestinations(node);
         m_linkedDestinationsValid = true;
@@ skipping 109 matching lines @@
         printContext.spoolPage(graphicsContext, pageIndex, pageWidth);
         graphicsContext.restore();
 
         currentHeight += pageSizeInPixels.height() + 1;
     }
 
     graphicsContext.restore();
 }
 
 }